ese is a naturally occurring element released from mineral deposits as well as industrial use.0.46 ppb1.2 ppbNo50 ppbNo50 ppbFoaming agents (surfactants)Foaming agents (surfactants) are detergents or detergent-like substances used as cleaning agents in industrial and consumer goods such as personal care products; they are also used as inert ingredients in pesticides.10 ppb36.33 ppbNo500 ppbNo500 p